3 files changed, 153 insertions, 64 deletions

diff --git a/arch/arm/mach-footbridge/dc21285-timer.c b/arch/arm/mach-footbridge/dc21285-timer.c
index bc5e83fb5819..a921fe92b858 100644
--- a/arch/arm/mach-footbridge/dc21285-timer.c
+++ b/arch/arm/mach-footbridge/dc21285-timer.c
@@ -4,10 +4,11 @@
  *  Copyright (C) 1998 Russell King.
  *  Copyright (C) 1998 Phil Blundell
  */
+#include <linux/clockchips.h>
+#include <linux/clocksource.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
-#include <linux/spinlock.h>
 
 #include <asm/irq.h>
 
@@ -16,32 +17,76 @@
 
 #include "common.h"
 
-/*
- * Footbridge timer 1 support.
- */
-static unsigned long timer1_latch;
+static cycle_t cksrc_dc21285_read(struct clocksource *cs)
+{
+	return cs->mask - *CSR_TIMER2_VALUE;
+}
 
-static unsigned long timer1_gettimeoffset (void)
+static int cksrc_dc21285_enable(struct clocksource *cs)
 {
-	unsigned long value = timer1_latch - *CSR_TIMER1_VALUE;
+	*CSR_TIMER2_LOAD = cs->mask;
+	*CSR_TIMER2_CLR = 0;
+	*CSR_TIMER2_CNTL = TIMER_CNTL_ENABLE | TIMER_CNTL_DIV16;
+	return 0;
+}
 
-	return ((tick_nsec / 1000) * value) / timer1_latch;
+static int cksrc_dc21285_disable(struct clocksource *cs)
+{
+	*CSR_TIMER2_CNTL = 0;
 }
 
-static irqreturn_t
-timer1_interrupt(int irq, void *dev_id)
+static struct clocksource cksrc_dc21285 = {
+	.name		= "dc21285_timer2",
+	.rating		= 200,
+	.read		= cksrc_dc21285_read,
+	.enable		= cksrc_dc21285_enable,
+	.disable	= cksrc_dc21285_disable,
+	.mask		= CLOCKSOURCE_MASK(24),
+	.flags		= CLOCK_SOURCE_IS_CONTINUOUS,
+};
+
+static void ckevt_dc21285_set_mode(enum clock_event_mode mode,
+	struct clock_event_device *c)
 {
+	switch (mode) {
+	case CLOCK_EVT_MODE_RESUME:
+	case CLOCK_EVT_MODE_PERIODIC:
+		*CSR_TIMER1_CLR = 0;
+		*CSR_TIMER1_LOAD = (mem_fclk_21285 + 8 * HZ) / (16 * HZ);
+		*CSR_TIMER1_CNTL = TIMER_CNTL_ENABLE | TIMER_CNTL_AUTORELOAD |
+				   TIMER_CNTL_DIV16;
+		break;
+
+	default:
+		*CSR_TIMER1_CNTL = 0;
+		break;
+	}
+}
+
+static struct clock_event_device ckevt_dc21285 = {
+	.name		= "dc21285_timer1",
+	.features	= CLOCK_EVT_FEAT_PERIODIC,
+	.rating		= 200,
+	.irq		= IRQ_TIMER1,
+	.set_mode	= ckevt_dc21285_set_mode,
+};
+
+static irqreturn_t timer1_interrupt(int irq, void *dev_id)
+{
+	struct clock_event_device *ce = dev_id;
+
 	*CSR_TIMER1_CLR = 0;
 
-	timer_tick();
+	ce->event_handler(ce);
 
 	return IRQ_HANDLED;
 }
 
 static struct irqaction footbridge_timer_irq = {
-	.name		= "Timer1 timer tick",
+	.name		= "dc21285_timer1",
 	.handler	= timer1_interrupt,
 	.flags		= IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
+	.dev_id		= &ckevt_dc21285,
 };
 
 /*
@@ -49,16 +94,19 @@ static struct irqaction footbridge_timer_irq = {
  */
 static void __init footbridge_timer_init(void)
 {
-	timer1_latch = (mem_fclk_21285 + 8 * HZ) / (16 * HZ);
+	struct clock_event_device *ce = &ckevt_dc21285;
+
+	clocksource_register_hz(&cksrc_dc21285, (mem_fclk_21285 + 8) / 16);
+
+	setup_irq(ce->irq, &footbridge_timer_irq);
 
-	*CSR_TIMER1_CLR  = 0;
-	*CSR_TIMER1_LOAD = timer1_latch;
-	*CSR_TIMER1_CNTL = TIMER_CNTL_ENABLE | TIMER_CNTL_AUTORELOAD | TIMER_CNTL_DIV16;
+	clockevents_calc_mult_shift(ce, mem_fclk_21285, 5);
+	ce->max_delta_ns = clockevent_delta2ns(0xffffff, ce);
+	ce->min_delta_ns = clockevent_delta2ns(0x000004, ce);
 
-	setup_irq(IRQ_TIMER1, &footbridge_timer_irq);
+	clockevents_register_device(ce);
 }
 
 struct sys_timer footbridge_timer = {
 	.init		= footbridge_timer_init,
-	.offset		= timer1_gettimeoffset,
 };
diff --git a/arch/arm/mach-footbridge/include/mach/debug-macro.S b/arch/arm/mach-footbridge/include/mach/debug-macro.S
index 3c9e0c40c679..30b971d65815 100644
--- a/arch/arm/mach-footbridge/include/mach/debug-macro.S
+++ b/arch/arm/mach-footbridge/include/mach/debug-macro.S
@@ -17,8 +17,8 @@
 	/* For NetWinder debugging */
 		.macro	addruart, rp, rv
 		mov	\rp, #0x000003f8
-		orr	\rv, \rp, #0x7c000000	@ physical
-		orr	\rp, \rp, #0xff000000	@ virtual
+		orr	\rv, \rp, #0xff000000	@ virtual
+		orr	\rp, \rp, #0x7c000000	@ physical
 		.endm
 
 #define UART_SHIFT	0
diff --git a/arch/arm/mach-footbridge/isa-timer.c b/arch/arm/mach-footbridge/isa-timer.c
index f488fa2082d7..441c6ce0d555 100644
--- a/arch/arm/mach-footbridge/isa-timer.c
+++ b/arch/arm/mach-footbridge/isa-timer.c
@@ -4,10 +4,13 @@
  *  Copyright (C) 1998 Russell King.
  *  Copyright (C) 1998 Phil Blundell
  */
+#include <linux/clockchips.h>
+#include <linux/clocksource.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/io.h>
+#include <linux/timex.h>
 
 #include <asm/irq.h>
 
@@ -15,77 +18,115 @@
 
 #include "common.h"
 
-/*
- * ISA timer tick support
- */
-#define mSEC_10_from_14 ((14318180 + 100) / 200)
+#define PIT_MODE	0x43
+#define PIT_CH0		0x40
+
+#define PIT_LATCH	((PIT_TICK_RATE + HZ / 2) / HZ)
 
-static unsigned long isa_gettimeoffset(void)
+static cycle_t pit_read(struct clocksource *cs)
 {
+	unsigned long flags;
+	static int old_count;
+	static u32 old_jifs;
 	int count;
+	u32 jifs;
 
-	static int count_p = (mSEC_10_from_14/6);    /* for the first call after boot */
-	static unsigned long jiffies_p = 0;
+	raw_local_irq_save(flags);
 
-	/*
-	 * cache volatile jiffies temporarily; we have IRQs turned off. 
-	 */
-	unsigned long jiffies_t;
+	jifs = jiffies;
+	outb_p(0x00, PIT_MODE);		/* latch the count */
+	count = inb_p(PIT_CH0);		/* read the latched count */
+	count |= inb_p(PIT_CH0) << 8;
 
-	/* timer count may underflow right here */
-	outb_p(0x00, 0x43);	/* latch the count ASAP */
+	if (count > old_count && jifs == old_jifs)
+		count = old_count;
 
-	count = inb_p(0x40);	/* read the latched count */
+	old_count = count;
+	old_jifs = jifs;
 
-	/*
-	 * We do this guaranteed double memory access instead of a _p 
-	 * postfix in the previous port access. Wheee, hackady hack
-	 */
- 	jiffies_t = jiffies;
+	raw_local_irq_restore(flags);
 
-	count |= inb_p(0x40) << 8;
+	count = (PIT_LATCH - 1) - count;
 
-	/* Detect timer underflows.  If we haven't had a timer tick since 
-	   the last time we were called, and time is apparently going
-	   backwards, the counter must have wrapped during this routine. */
-	if ((jiffies_t == jiffies_p) && (count > count_p))
-		count -= (mSEC_10_from_14/6);
-	else
-		jiffies_p = jiffies_t;
+	return (cycle_t)(jifs * PIT_LATCH) + count;
+}
 
-	count_p = count;
+static struct clocksource pit_cs = {
+	.name		= "pit",
+	.rating		= 110,
+	.read		= pit_read,
+	.mask		= CLOCKSOURCE_MASK(32),
+};
 
-	count = (((mSEC_10_from_14/6)-1) - count) * (tick_nsec / 1000);
-	count = (count + (mSEC_10_from_14/6)/2) / (mSEC_10_from_14/6);
+static void pit_set_mode(enum clock_event_mode mode,
+	struct clock_event_device *evt)
+{
+	unsigned long flags;
+
+	raw_local_irq_save(flags);
+
+	switch (mode) {
+	case CLOCK_EVT_MODE_PERIODIC:
+		outb_p(0x34, PIT_MODE);
+		outb_p(PIT_LATCH & 0xff, PIT_CH0);
+		outb_p(PIT_LATCH >> 8, PIT_CH0);
+		break;
+
+	case CLOCK_EVT_MODE_SHUTDOWN:
+	case CLOCK_EVT_MODE_UNUSED:
+		outb_p(0x30, PIT_MODE);
+		outb_p(0, PIT_CH0);
+		outb_p(0, PIT_CH0);
+		break;
+
+	case CLOCK_EVT_MODE_ONESHOT:
+	case CLOCK_EVT_MODE_RESUME:
+		break;
+	}
+	local_irq_restore(flags);
+}
 
-	return count;
+static int pit_set_next_event(unsigned long delta,
+	struct clock_event_device *evt)
+{
+	return 0;
 }
 
-static irqreturn_t
-isa_timer_interrupt(int irq, void *dev_id)
+static struct clock_event_device pit_ce = {
+	.name		= "pit",
+	.features	= CLOCK_EVT_FEAT_PERIODIC,
+	.set_mode	= pit_set_mode,
+	.set_next_event	= pit_set_next_event,
+	.shift		= 32,
+};
+
+static irqreturn_t pit_timer_interrupt(int irq, void *dev_id)
 {
-	timer_tick();
+	struct clock_event_device *ce = dev_id;
+	ce->event_handler(ce);
 	return IRQ_HANDLED;
 }
 
-static struct irqaction isa_timer_irq = {
-	.name		= "ISA timer tick",
-	.handler	= isa_timer_interrupt,
+static struct irqaction pit_timer_irq = {
+	.name		= "pit",
+	.handler	= pit_timer_interrupt,
 	.flags		= IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
+	.dev_id		= &pit_ce,
 };
 
 static void __init isa_timer_init(void)
 {
-	/* enable PIT timer */
-	/* set for periodic (4) and LSB/MSB write (0x30) */
-	outb(0x34, 0x43);
-	outb((mSEC_10_from_14/6) & 0xFF, 0x40);
-	outb((mSEC_10_from_14/6) >> 8, 0x40);
+	pit_ce.cpumask = cpumask_of(smp_processor_id());
+	pit_ce.mult = div_sc(PIT_TICK_RATE, NSEC_PER_SEC, pit_ce.shift);
+	pit_ce.max_delta_ns = clockevent_delta2ns(0x7fff, &pit_ce);
+	pit_ce.min_delta_ns = clockevent_delta2ns(0x000f, &pit_ce);
+
+	clocksource_register_hz(&pit_cs, PIT_TICK_RATE);
 
-	setup_irq(IRQ_ISA_TIMER, &isa_timer_irq);
+	setup_irq(pit_ce.irq, &pit_timer_irq);
+	clockevents_register_device(&pit_ce);
 }
 
 struct sys_timer isa_timer = {
 	.init		= isa_timer_init,
-	.offset		= isa_gettimeoffset,
 };